A PRELIMINARY LOW-FIDELITY MDO APPROACH FOR LOAD ALLEVIATION THROUGH MOVABLES ON HAR WING
Résumé
As part of the current e↵orts targeting further development on cleaner and more e cient aviation, this study proposes a new MDO approach for an optimized High Aspect Ratio (HAR) wing weight using a load alleviation. Load Alleviation Function (LAF) aims at diminishing the peak wing bending moment due to a manoeuvre or a gust by redistributing the lift to a more inboard position on the wing using movables to decrease the overall wing weight. Nowadays, movables are exclusively designed to master the control of the aircraft, and LAF takes advantage of these control surfaces characteristics despite not being designed for it. The challenge of LAF tuning on a HAR will come from the high wing deformation. So this study aims to address the handling qualities (HQ) and LAF aspects in an optimization process of the control surfaces positioning, actuators power, sizes and deflections covering both disciplines, with a wing weight reduction intent. The challenges faced within the project reside in the couplings of the numerous disciplines present in the overall aircraft design: aerodynamics, loads, static aeroelasticity (movable control reversal), HQ, stress, and mass. A highlight will be made on the aerodynamic and loads disciplines, as current MDO publications do not consider a broad number of load cases and flight points with the right coverage of the sub-loads disciplines (such as gust and its aerodynamic specificities), which are crucial in the ranking of di↵erent designs, and crucial in the assessment of its feasibility, and finally for certification. This study aims to define the MDO framework by identifying the right compromise between disciplines and fidelities whilst preserving the computational resources. In the first stages, the project focuses on the lower-fidelity approaches through open-source means to verify its feasibility and compile the requirements, targeting to include multi-fidelity approaches at future stages of the research project.
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